lat_tcp - measure interprocess communication latency via TCP/IP
[ -m <message size>
] [ -P
] [ -W <warmups>
] [ -N
lat_tcp -S hostname
is a client/server program that measures interprocess
communication latencies. The benchmark passes a message back and forth between
the two processes (this sort of benchmark is frequently referred to as a ``hot
potato'' benchmark). No other work is done in the processes.
has three forms of usage: as a server (-s), as a client (lat_tcp
localhost), and as a shutdown (lat_tcp -S localhost).
The reported time is in microseconds per round trip and includes the total time,
i.e., the context switching overhead is includeded. Output format is like so
TCP latency using localhost: 700 microseconds
Funding for the development of this tool was provided by Sun Microsystems
lmbench(8), lat_fcntl(8), lat_fifo(8), lat_tcp(8), lat_udp(8), lat_unix(8).
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.